LS1 coil wiring
Thread Starter
Melting Slicks
Joined: Jul 2004
Posts: 2,844
Likes: 144
From: Northern Ireland
LS1 coil wiring
I tried a search, but couldnt find any info.
Im doing an install using an LS1, with an aftermarket ecu, but I need to know what the 4 wires are going to each coil ??
I can assume one is a +12v, one a -ve trigger, and one a chassis ground.
What is the 4th wire for ??
Ive had this reply on LS1 tech so far....
From Corvette fuel injection, the four wires are:
Ignition positive voltage - pink
Ignition Control Signal - light blue, purple, dark green, or red depending on which coil
Reference low - brown
Ground - black
can anyone identify what the brown/ reference low wire does or if it is neceassary.
My ecu only has the normal trigger setup for firing a coil, which is one trigger wire per coil.
Cheers, Stevie
Im doing an install using an LS1, with an aftermarket ecu, but I need to know what the 4 wires are going to each coil ??
I can assume one is a +12v, one a -ve trigger, and one a chassis ground.
What is the 4th wire for ??
Ive had this reply on LS1 tech so far....
From Corvette fuel injection, the four wires are:
Ignition positive voltage - pink
Ignition Control Signal - light blue, purple, dark green, or red depending on which coil
Reference low - brown
Ground - black
can anyone identify what the brown/ reference low wire does or if it is neceassary.
My ecu only has the normal trigger setup for firing a coil, which is one trigger wire per coil.
Cheers, Stevie
Le Mans Master
Joined: Jul 2002
Posts: 7,370
Likes: 8
From: Slave to the evil empire
Cruise-In V Veteran
St. Jude Donor '04
The wiring diagram shows the brown wire going into the PCM and like you said it's labeled "low reference" so I guess since your aftermarket ECM doesn't use the low reference just cap and stow the extra wire and see if it has any affect on the coil, I doubt it will. 
Pro
Joined: Jun 2003
Posts: 702
Likes: 0
From: Castle Rock Co
Originally Posted by stevieturbo
I tried a search, but couldnt find any info.
Im doing an install using an LS1, with an aftermarket ecu, but I need to know what the 4 wires are going to each coil ??
I can assume one is a +12v, one a -ve trigger, and one a chassis ground.
What is the 4th wire for ??
Ive had this reply on LS1 tech so far....
From Corvette fuel injection, the four wires are:
Ignition positive voltage - pink
Ignition Control Signal - light blue, purple, dark green, or red depending on which coil
Reference low - brown
Ground - black
can anyone identify what the brown/ reference low wire does or if it is neceassary.
My ecu only has the normal trigger setup for firing a coil, which is one trigger wire per coil.
Cheers, Stevie
Im doing an install using an LS1, with an aftermarket ecu, but I need to know what the 4 wires are going to each coil ??
I can assume one is a +12v, one a -ve trigger, and one a chassis ground.
What is the 4th wire for ??
Ive had this reply on LS1 tech so far....
From Corvette fuel injection, the four wires are:
Ignition positive voltage - pink
Ignition Control Signal - light blue, purple, dark green, or red depending on which coil
Reference low - brown
Ground - black
can anyone identify what the brown/ reference low wire does or if it is neceassary.
My ecu only has the normal trigger setup for firing a coil, which is one trigger wire per coil.
Cheers, Stevie
If you don't have a distributor, or an electronic equivalent, you won't be able to use a aftermarket ECU setup on the LS1.
Thread Starter
Melting Slicks
Joined: Jul 2004
Posts: 2,844
Likes: 144
From: Northern Ireland
Can you elaborate ?
Why woud a distributor be of any use on a car with 8 coils ?
All coils I have came across before simply switch to ground to fire. ie when the trigger wire is grounded, the coil is on. When released, it fires via back emf. Are you saying these coils are totally different then ?
What about aftermarket high power coils then, that feature normal wiring methods, that would bolt onto the LS1 brackets ?
Why woud a distributor be of any use on a car with 8 coils ?
All coils I have came across before simply switch to ground to fire. ie when the trigger wire is grounded, the coil is on. When released, it fires via back emf. Are you saying these coils are totally different then ?
What about aftermarket high power coils then, that feature normal wiring methods, that would bolt onto the LS1 brackets ?
